var superagent = require('superagent');
let url = `https://www.zhihu.com/api/v4/topics/19776749/feeds/timeline_question?limit=10&offset=30000`;
var time0 = (new Date).getTime();
superagent.get(url).end(function (err, res) {
    if (res) {
        var time1 = (new Date).getTime();
        console.log(time1 - time0);

    }
})